If you are looking for a 'root cause' of terrorism, look no further than Sura Nine from the Koran. Anyone interested in the subject of radical Islam should read this. If honestly discussing what any Muslim would already know creates terrorism, I plead guilty. This is must reading.
This includes the three major translations of a key verse (9.5):
YUSUFALI: But when the forbidden months are past, then fight and slay the Pagans wherever ye find them, an seize them, beleaguer them, and lie in wait for them in every stratagem (of war); but if they repent, and establish regular prayers and practise regular charity, then open the way for them: for Allah is Oft-forgiving, Most Merciful.
PICKTHAL: Then, when the sacred months have passed, slay the idolaters wherever ye find them, and take them (captive), and besiege them, and prepare for them each ambush. But if they repent and establish worship and pay the poor-due, then leave their way free. Lo! Allah is Forgiving, Merciful.
SHAKIR: So when the sacred months have passed away, then slay the idolaters wherever you find them, and take them captives and besiege them and lie in wait for them in every ambush, then if they repent and keep up prayer and pay the poor-rate, leave their way free to them; surely Allah is Forgiving, Merciful.
The "poor-rate" is what's known as jizya - a tax on non-Muslims living under Muslim control.
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